Tweedledee and Tweedledum: Eh, and there's a moral to it.
Alice: Oh, yes, a very good moral! If you happen to be an oyster.
The White Rabbit's Double Take when the Dodo causally suggests he set the house on fire to smoke out "the monster" (Alice).
After Bill the Lizard has been shot off into the sky, both the Dodo and Alice give us this casual little bit, as if they'd seen it many, many times before:
Dodo: There goes Bill.
Alice: Poor Bill.
The Cheshire Cat's scenes are all hilarious, especially at the trial.
The March Hare's quite direct solution to the "MAD WATCH!" - whacking it with a mallet. The mainspring slowly unwinds itself - until the Hatter gives the White Rabbit his (mangled) watch back. The mournful look is priceless.